Disk grinder



March 1, 1949 COLEMAN 2,462,947

DISK GRINDER Filed March 2, 1948 2 SheetsSheet 1 Paul M. Coleman IN: E.-\ TOR.

March 1, 1949. P M COLEMAN 2,462,947

DISK GRINDER Filed March 2. 194a v 2 Sheets-Sheet '2 Fig.3.

' 108 l2 m4 s Fig. 4. //2

v I/ h f" //a 54 \/36 i [W II E Paul M. Coleman /30 JNVENTOR.

Patented Mar. 1, 1949 UNITED STATES PATENT OFFICE This invention relates to improvements in grinding apparatus and the principal object is to provide a device capable of carrying out the desired purposes.

Another object of the invention is to provide a device whereby the object being ground will bear against the grinding wheel of the apparatus at all times.

And another object of the invention is to provide means to shift the work holding means horizontally forward or backward.

And still another object of the invention is to provide means to raise or lower the work holding means.

A further object of the invention is to provide means capable of quickly disengaging the work from the grinding wheel for removal therefrom.

A still further object of the invention is to provide means to hold the work holding means in inoperative position.

And a still further object of the invention is to rotate the grinding wheel and work holder simultaneously to avoid damaging the object being sharpened.

And yet another object of the invention is to provide a device that is efficient, will not injure the work, capable of being manufactured inexpensively, is durable, compact in design, and can be adapted to any type of operating means.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination and arrangement of parts hereinafter more fully described and illustrated, and claimed, in which:

Figure 1 is a perspective view of the device of the invention, with certain parts broken away for illustration;

Figure 2 is a vertical sectional view taken on line 2-2 of Figure 3, with certain structure removed;

Figure 3 is a sectional view in elevation of the device of theinvention, and

Figure 4 is a horizontal, sectional view taken on line 4-4 of Figure 3, with certain structure removed.

Corresponding and like parts are referred to in the followin description and indicated in all of the views of the accompanying drawings.

Referring to the figures, the grinding or sharpening machine is generally shown at H] and includes a frame l2, supports or standards I4, l6, grinding means l8 and a disk or work holder 20. The machine is especially adapted for grinding disks such as are'u'sed on farm machinery 7 Claims. (01. 51-106) such as harrows, plows and the like, which have become dull and require sharpening. The machine preferably is operated at about 2500 R. P. M., but of course, any desired speed may be employed.

Frame I2 is rectangular in shape and is made of channel iron preferably, and retains therein for horizontal movement, a carriage 22, whose function will later be described. Integral with one end of frame l2 and in T relation thereto is a horizontal arm 24, supported by a single vertical standard l6. Mounted on arm 24 is the grinding means I8, which includes an arbor 26 and pulley means 28 and 30 on each end. An abrasive wheel 32, consisting of emery or other similar material, is mounted on one end of shaft 26 for positive engagement with a disk to be sharpened. Wheel 32 is secured to shaft 26 by suitable locking means 34.

Intermediate the length of standard l6, and parallel to arm 24, is a second transverse arm 36 from which a bearing 38 depends. Arm 36 also includes a transverse shaft 40 above bearing 38 which is telescopically received in a transverse sleeve member 42 and are securely bolted together at 4'4. Sleeve 42 includes a depending bearing 46 and upwardly inclined leg 48, which leg terminates near the lower end of work holder 20 as is clearly illustrated in Figures 1 and 3. Bearings 38 and 46 are spaced apart horizontally and rotary shaft 50 is journalled therethrough. Shaft 56 includes a large pulley 52 mounted thereon, over which a pulley belt 54 is trained, belt 54 being trained over pulley 30 at its other extreme. A bevel gear 56 is secured to the other extremity of shaft 50 and cooperates with a second bevel gear 58 mounted on shaft 69. Shaft 66 extends through leg 48 and contains a small gear wheel 62 on its other end. Gear 62 operatively engages with a large gear wheel 64, gear 64 being mounted on holder 20 for rotation of the disk which is being sharpened.

Standards [4, of which there are two disclosed, although any desired number may be used, are preferably of channel iron and contain a transverse bar 66 which acts as a brace for supports l4, as well as securing means for a pair of angle irons 68.

Angle irons 68 are secured, by suitable bolt means ill, or the like, an ear 12 extending at right angles from a hollow shaft 14. Shaft 14 slidably retains a rod member 16 extending therethrough and gear 64 is mounted on the outer end thereof. A universal joint 18 connects rod 16 with a second, rectangular rod 80, carried in sleeve 82. Rod 80 includes a second universal joint 64 connecting with a rod 66 threaded on its free extremity at 66 to retain a disk 96 mounted thereon for sharpening, by any suitable means such as clamping handle 92 and clamp member 94. A foot pedal 96 is mounted at 98 for pivotal engagement of ear I66 with the lower extremity of rod 6, for a purpose that will shortly become apparent.

Horizontal carriage 22 is U-shaped, the parallel arms E64 being slidably retained within the flanges of frame I2 and transverse bar I66 joins the rear end of arms I64. A pair of flanged bars I68 (see Figures 1, 2 and 4) are secured in any preferred manner to the inner surfaces of arms I64 and depend perpendicularly therefrom, as is readily seen in the figures. A transverse supporting bar [I6 is secured to the bottom of bars I66. slidably retained within the flanges of bars I66 is a vertical, U-shaped carriage consisting of arms II 2 joined at the lower ends bytransverse bar II 4. A looped bracket H6 is suitably mounted on bar H4 by bolts M6 to retain, for vertical movement therethrough, a threaded rod I26. Rod I26 extends through a U-shaped bracket I22 and terminates in a bevel gear I24. Ears I26 on brackets I22 are apertured to receive a shaft I26 uponwhich a hand wheel I30 is mounted, shaft I28 extendingthrough a bearing I32 mounted on bracket I22 to include a bevel gear I34 which meshes with gear I24 of rod I26. Thus, it is readily apparent that on turning wheel I69, arms IIZ are vertically adjusted by rotation of bevel gears I 24, 34. Support bar H6 assumes the additional function therefore, of limiting downward movement of arms I I2 by engagement with transverse bar II 4.

In order to obtain horizontal movement as well, bar I66 (see Figure 4) is apertured at I 36 to receive threaded rod I38. Rod I38 extends through frame I2 and terminates in a hand wheel I iil, which, upon rotation, serves to move carriage 22 in a horizontal plane.

Referring to arms. I'I2 again (see Figures 1 through 3), the upper free extremities thereof support a transverse bar I42, secured to arms I I2 by means of a pair of flanges I44 through which suitable bolt or rivet means I46 extend. Bar I 42 is riveted to a shorter complementary bar I 46 integral on work holder 26 adjacent a disk 96. As is readily seen in Figure l, a weight I 56' is supported by a suitable wire or rope I52 from a horizontal ear I54 secured to one arm H2, in order to assure'the abutment of disk '90 on emery wheel 32. A lever I56 includes a pawl I58 journalled to a latching finger I66 adapted to engage a quadrant segment I62 mounted on the other arm II 2. The cam surface thereof is smooth except for an extending notch I64 at its upper end to limit movement of finger I66. Finger I6!) is mounted to freely travel on the cam edge of quadrant I 62, governed by the rotation of disk 60.

Foot pedal 96 serves to disengage the disk from the grinding wheel 32, when it is desired to change disks and still leave the machine in operation. Pedal 96 upon depression by the operator, engages the bottom of rod I6 to raise same and thus disengage large gear 64 from gear 62. A latch I66 (see Figure 1) holds gear 64 in raised position while the disk is changed. When Work holder is is not operating, latch I66 hooks under the bottom of quadrant I62 to remain in fixed position. When a new disk is inserted, pedal 96 is released and the assembly dropped into operating position.

4 Referring to Figure 3, a motor I68 is shown mounted by suitable brackets I on a horizontal support I12 secured to standard I6. A pair of pulley-s I"I4, supported on a. suitable drive shaft, include belts I16 trained thereover and over pulleys 28 on arbor 26. Thus, as is readily apparent, motor I68 drives the grinding wheel as well as the work holding means so that emery wheel 12 rotates in a vertical plane while disk 96 rotates in an approximately horizontal plane.

From the foregoing, the operation of the device is readily apparent. A disk to be sharpened is placed on rod 86 and secured thereon by handle 92 and clamp 94. In order to adjust the angle of the bevelled edge of the disk, wheel I30 is rotated to vertically raise or lower arms II2, as necessary. When the size of the disk is such that adjustment is necessary-for contact with wheel 32, hand wheel I46 is rotated to move carriage 32 either to the left or right in a horizontal plane. Weight I56, assists in assuring positive contact at all times of disk 90 with emery wheel 32. When it is necessary to change the disks being ground, pedal 66 is depressed to raise gear 64 for disengagement with rotating gear 62. Upon insertion of a new disk, the assembly is retained to operative position, and after any necessary Vertical or horizontal adjustments have been made, the grinding operation is repeated without the necessity for stopping motor I68. Gear 64 is locked by latch I66 while the disks are being changed and lever I56 is actuated into latching engagement with quadrant I62 when the disk carrier means is not operating.

It is to be understood that as many modifications of the embodiments above illustrated might be made without departing from the spirit or scope of the present invention, and it is intended that the above description, accompanying drawings and claims shall be interpreted as illustrative and not in a limiting sense.

Having described the invention what is claimed as new is:

1. In a disk grinding machine, in combination with a grinding wheel, a main support frame, disk holding means extending therethrough, and secured to said frame, means mounted on said frame and secured to said disk holding means for vertical adjustment thereof, means slidably mounted on said frame and secured to said disk holding means for horizontal adjustment, and means to simultaneously rotate said grinding wheel and disk holding means, said vertical adjusting means including a pair of oppositely disposed bars secured to said slidable means, a vertical U-shaped carriage slidably mounted within said bars and means to vertically move said carriage.

2. The combination of claim 1, wherein said last named means includes a pair of cooperating bevel gears mounted on said adjusting means and a hand wheel to operate said bevel gears.

3. In a disk grinding machine, in combination with a grinding wheel, a main support frame, disk holding means extending therethrough, and secured to said frame, means mounted on said frame and secured to said disk holding means for vertical adjustment thereof, means slidably mounted on said frame and secured to said disk holding means for horizontal adjustment, and means to simultaneously rotate said grinding wheel and disk holding means, said vertical adjusting means including a pair of oppositely disposed. bars secured to said slidable means, a vertical U-shaped carriage slidably mounted within said bars and means to vertically move said carriage, said last named means including an apertured loop bracket secured to said carriage, an apertured transverse bar, a threaded rod extending through said apertures and terminating in a bevel gear, a shaft mounted on said transverse bar and terminating in a bevel gear in engagement with said first bevel gear, and a hand wheel secured to said shaft to operate the adjusting means.

4. In a disk grinding machine, in combina tion with a grinding wheel, a main support frame, disk holding means extending therethrough and secured to said frame, means mounted on said frame and secured to said disk holding means for vertical adjustment thereof, means slidably mounted on said frame and secured to said disk holding means for horizontal adjustment, said vertical adjusting means including a vertical U- shaped carriage slidably secured to said horizontal adjusting means, means on said carriage to move same, means secured to said carriage to lock said disk holding means against rotation, and a Weight secured to said carriage and depending therefrom to urge said holding means against said grinding wheel.

5. The combination of claim 4, wherein said locking means consists of a cam surfaced quadrant segment, a notch in the upper end of said cam, an actuating lever and a latching finger mounted on said lever and engaging said cam surface and adapted to be locked against movement.

6. In a disk grinding machine, in combination with a grinding wheel, a main support frame,

disk holding means extending therethrough, and secured to said frame, means mounted on said frame and secured to said disk holding means for vertical adjustment thereof, means slidably mounted on said frame and secured to said disk holding means for horizontal adjustment, and means to simultaneously rotate said grinding Wheel and disk holding means, said disk holding means including a sleeve member secured to said support frame, a rod slidably retained by sleeve, a large gear mounted on said sleeve, a plurality of gears secured to said frame and operated by said rotating means, one of said gears engaging said large gear, a disk on the other end of said holding means and engaging said grinding wheel, and means mounted on said support to move said large gear into inoperative position.

'2. The combination of claim 6, wherein latching means is secured to said frame and engages said large gear to lock same when in inoperative position.

PAUL M. COLEMAN.

CITED The-following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 337,623 Shaw et a1. Mar. 2, 1886 862,724 Fields Aug. 6, 1907 1,063,631 McCaughey Sept. 19, 1911 2,386,563 Moore Oct. 9, 19 5 

